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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c3c7aaa0587df4f1d2612a53949cb9e6e79da01e061a8a9e5a815e7fd13b83' 
  AND token = 'Aw60hlU9LnwLyqjW36h7TVAQ1KgWTxQ8M0Cvbswza80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}